If she just graduated high school, she’s a freshman applicant (her cc credits will get her advanced standing after admission) as long as she doesn’t take any college class. Freshman status is crucial for her, because full tuition and full ride scholarships only go to students with freshman status.
What was her GPA (hs, cc)? Her sat o axt score ?
This is a terrible betrayal by her stepdad but there’s nothing she can expect now after such promise was broken, and at least she knows it. She is free to move forward if that free tuition or free ride takes her to Mississippi or Arkansas or South Carolina or Maine.
If our provide the stats we here can tell you if that’s a path forward that is even possible.